<?php

if (! defined ( 'BASEPATH' ))
	exit ( 'No direct script access allowed' );
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------


/**
 * MySQL Utility Class
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility {
	
	/**
	 * List databases
	 *
	 * @access	private
	 * @return	bool
	 */
	function _list_databases() {
		return "SHOW DATABASES";
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Optimize table query
	 *
	 * Generates a platform-specific query so that a table can be optimized
	 *
	 * @access	private
	 * @param	string	the table name
	 * @return	object
	 */
	function _optimize_table($table) {
		return "OPTIMIZE TABLE " . $this->db->_escape_identifiers ( $table );
	}
	
	// --------------------------------------------------------------------
	

	/**
	 * Repair table query
	 *
	 * Generates a platform-specific query so that a table can be repaired
	 *
	 * @access	private
	 * @param	string	the table name
	 * @return	object
	 */
	function _repair_table($table) {
		return "REPAIR TABLE " . $this->db->_escape_identifiers ( $table );
	}
	
	// --------------------------------------------------------------------
	/**
	 * MySQL Export
	 *
	 * @access	private
	 * @param	array	Preferences
	 * @return	mixed
	 */
	function _backup($params = array()) {
		if (count ( $params ) == 0) {
			return FALSE;
		}
		
		// Extract the prefs for simplicity
		extract ( $params );
		
		// Build the output
		$output = '';
		foreach ( ( array ) $tables as $table ) {
			// Is the table in the "ignore" list?
			if (in_array ( $table, ( array ) $ignore, TRUE )) {
				continue;
			}
			
			// Get the table schema
			$query = $this->db->query ( "SHOW CREATE TABLE `" . $this->db->database . '`.' . $table );
			
			// No result means the table name was invalid
			if ($query === FALSE) {
				continue;
			}
			
			// Write out the table schema
			$output .= '#' . $newline . '# TABLE STRUCTURE FOR: ' . $table . $newline . '#' . $newline . $newline;
			
			if ($add_drop == TRUE) {
				$output .= 'DROP TABLE IF EXISTS ' . $table . ';' . $newline . $newline;
			}
			
			$i = 0;
			$result = $query->result_array ();
			foreach ( $result [0] as $val ) {
				if ($i ++ % 2) {
					$output .= $val . ';' . $newline . $newline;
				}
			}
			
			// If inserts are not needed we're done...
			if ($add_insert == FALSE) {
				continue;
			}
			
			// Grab all the data from the current table
			$query = $this->db->query ( "SELECT * FROM $table" );
			
			if ($query->num_rows () == 0) {
				continue;
			}
			
			// Fetch the field names and determine if the field is an
			// integer type.  We use this info to decide whether to
			// surround the data with quotes or not
			

			$i = 0;
			$field_str = '';
			$is_int = array ();
			while ( $field = mysql_fetch_field ( $query->result_id ) ) {
				// Most versions of MySQL store timestamp as a string
				$is_int [$i] = (in_array ( strtolower ( mysql_field_type ( $query->result_id, $i ) ), array ('tinyint', 'smallint', 'mediumint', 'int', 'bigint' ), //, 'timestamp'),
TRUE )) ? TRUE : FALSE;
				
				// Create a string of field names
				$field_str .= '`' . $field->name . '`, ';
				$i ++;
			}
			
			// Trim off the end comma
			$field_str = preg_replace ( "/, $/", "", $field_str );
			
			// Build the insert string
			foreach ( $query->result_array () as $row ) {
				$val_str = '';
				
				$i = 0;
				foreach ( $row as $v ) {
					// Is the value NULL?
					if ($v === NULL) {
						$val_str .= 'NULL';
					} else {
						// Escape the data if it's not an integer
						if ($is_int [$i] == FALSE) {
							$val_str .= $this->db->escape ( $v );
						} else {
							$val_str .= $v;
						}
					}
					
					// Append a comma
					$val_str .= ', ';
					$i ++;
				}
				
				// Remove the comma at the end of the string
				$val_str = preg_replace ( "/, $/", "", $val_str );
				
				// Build the INSERT string
				$output .= 'INSERT INTO ' . $table . ' (' . $field_str . ') VALUES (' . $val_str . ');' . $newline;
			}
			
			$output .= $newline . $newline;
		}
		
		return $output;
	}
}

/* End of file mysql_utility.php */
/* Location: ./system/database/drivers/mysql/mysql_utility.php */